[bug] pc.from_mpc no longer works.

[PB-vines]

Bug report checklis

• [X] Searched the issues page for similar reports

• [X] Read the relevant sections of the documentation

• [X] Browse the tutorials and tests for usefull code snippets and examples of use

• [X] Reproduced the issue after updating with pip install --upgrade pandapower (or git pull)

• [X] Tried basic troubleshooting (if a bug/error) like restarting the interpreter and checking the pythonpath

Reproducible Example

path = 'localpathtomy.matfile'
net = pc.from_mpc(path, f_hz=60, casename_mpc_file = 'ans', validate_conversion =False)

Issue Description and Traceback

I have been using the same code for a bit that converts networks and it worked fine. After upgrading paneapower the pc.from_mpc no longer works and yield this error: AttributeError: 'pandapowerNet' instance has no attribute '_options'

I have it with both python 3.8 and python 3.9.

Expected Behavior

This should convert the grid as it previously did before upgrading.

Installed Versions

• python version: * pandas version: * networkx version: * scipy version: * numpy version: * packaging version: * tqdm version: * deepdiff version: * Operating System name/version: 3.8/3.9

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